BTP

Hi all, I have question about a 95 Civic (1.5L). It has ticking noise that once warmed up only becomes louder. I hope is just a few loose valves/rockers. Also it seems to idle smooth at first when cold, but once warmed up tends to make a popping sound (from the exhaust) and run a bit rough. I took the car out for a drive and it felt like once warmed up it had a slight power loss too. Any thoughts on what to expect before I start taking it apart?

Thanks